Hi all!
Recently I have upgraded all my RB's (67 pcs.) to the latest version 5.12. After that I've noticed in dude that all my links stopped showing current speed and other SNMP info in The Dude. I have tried to change the SNMP version in dude to use v3 with no security with public community but still no success. Turned SNMP logging on. This it what it says:
15:07:02 snmp,debug getnextgetbulk .1.3.6.1.2.1.9999.1.1.6.4.1
15:07:02 snmp packet from: 172.16.150.1 version: 0
15:07:02 snmp community: public
15:07:02 snmp,debug getnextgetbulk .1.3.6.1.2.1.4.20.1 reps:0
15:07:02 snmp packet from: 172.16.150.1 version: 0
15:07:02 snmp community: public
15:07:02 snmp,debug getnextgetbulk .1.3.6.1.2.1.2.2.1 reps:0 n
15:07:03 system,info item removed by DIMA
15:07:05 snmp packet from: 172.16.150.1 version: 0
15:07:05 snmp community: public
15:07:05 snmp,debug getnextgetbulk .1.3.6.1.2.1.4.22.1 reps:0
15:07:05 snmp packet from: 172.16.150.1 version: 0
15:07:05 snmp community: public
15:07:05 snmp,debug getnextgetbulk .1.3.6.1.2.1.9999.1.1.6.4.1
15:07:05 snmp packet from: 172.16.150.1 version: 0
15:07:05 snmp community: public
15:07:05 snmp,debug getnextgetbulk .1.3.6.1.2.1.4.20.1 reps:0
15:07:05 snmp packet from: 172.16.150.1 version: 0
15:07:05 snmp community: public
15:07:05 snmp,debug getnextgetbulk .1.3.6.1.2.1.2.2.1 reps:0 n
Maybe someone has already found a clue. Would appreciate any helpful posts:)

Problem solved after I've upgraded the core router which hosts The Dude to 5.12. It was upgraded last because it was used till late time for work.